Emily Dickinson Lexicon

DISC'US, n. [L. See Eng. Dish and Disk.]

1. A quoit; a piece of iron, copper or stone, to be thrown in play; use by the ancients.
2. In botany, the middle plain part of a radiated compound flower, generally consisting of small florets, with a hollow regular petal, as in the marigold and daisy. – Bailey. Encyc.
3. The face or surface of the sun or moon. [See Disk.]